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3 ORIFICE FLANGES In Carbon, Alloy and Stainless 300lb. through 2500 lb. or Ring Joint ORIFICE FLANGES are widely used in conjunction with orifice meters for measuring the rate flow liquids and gases. They are basically the same as standard welding neck, slip-on and screwed flanges except for the provision radial, tapped holes in the flange ring for meter connections and additional bolts to act as jack screws to facilitate separating the flanges for inspection or replacement the orifice plate. In choosing the type orifice flange, the considerations affecting the choice welding neck, slip-on and screwed standard flanges apply with equal force. They are made in pressure classes 300 through 2500 lb.; in carbon steel, stainless steel and alloy materials; and raised face or ring joint. Welding neck and slip-on Orifice s in class 300 only are conform to ANSI B Other types and pressure classes are available and sizes larger than 24" will conform to MSS SP-44. Unions are furnished with gaskets, carbon steel jack screws, pipe plugs for the tapped openings, and bolting per ANSI B16.5. Tolerances and ratings follow ANSI B16.5 except for the following: 1. Tolerance for the tap-hole-to-face dimensions o ± 0.02" for flanges < 4" nominal size o ± 0.03" for flanges 4" nominal size 2. Tolerance for welding neck flange bores o ± 0.5% nominal size DIMENSIONAL TOLERANCES ORIFICE FLANGES ASME B16.36 Tolerances for B16.36 orifice flanges are the same as those for B16.5 with the following exceptions: Center Pressure Tap to 3 and smaller ±0.02" ±0.5 4 and larger ±0.03" ±0.8 Bore - s Only -- ±0.5% nominal bore size

4 Orifice s Class 300 ASME B16.36 Size (3) at Base at Point Welding Length thru Pressure Connection Number Bolt Bolt Bolts Bolt Circle O C R X A Y TT 1 in ¼ ⅝ ½ in ¼ ¾ in ¼ ⅝ ½ in ¼ ¾ in ⅜ ¾ in ½ ¾ in ½ ¾ in ½ 12 1 ⅞ in ½ in ½ ⅛ in ½ ⅛ in ½ ¼ in ½ ¼ in ½ ¼ in ½ ½ (1) Bore diameter to be specified by the purchaser. (2) Other NPT sizes may be furnished if required (3) Weld neck flanges 3 and smaller are identical to Class 600 flanges and may be so marked

5 Orifice s Slip-On, & Class 400 ASME B16.36 COMMON DIMENSIONS O.D at Base Minimum C Bore Slip- On LENGTH THRU HUB Y Diam. at Bevel to Counterbore O R X RF RTJ B2 RF RTJ RF RTJ A F ¼ ½ ½ APPROXIMATE WEIGHT PER UNION (Pounds) Bolt Circle DRILLING Number Bolts BOLTING Stud bolt Length RF RTJ RF RTJ RF RTJ ¼ ½ ½ All Dimensions are in inches. B1 Weld Neck bore to be specified by purchaser. Lengths include thickness two nuts but not height crown. 1/2" Pipe Taps 1/2" Drill for sizes 4" and over 3/8" Drill for size 3" 1/4" Drill for sizes 2 1/2" and under. ± Available in any required larger size

6 Orifice s Slip-On, & Class 600 ASME B16.36 COMMON DIMENSIONS O.D at Base Minimum C Bore Slip- On LENGTH THRU HUB Y Diam. at Bevel to Counterbore O R X RF RTJ B2 RF RTJ RF RTJ A F ¼ ½ ½ APPROXIMATE WEIGHT PER UNION (Pounds) Bolt Circle DRILLING Number Bolts BOLTING Stud bolt Length RF RTJ RF RTJ RF RTJ ¼ ½ ½ All Dimensions are in inches. B1 Weld Neck bore to be specified by purchaser. Lengths include thickness two nuts but not height crown. 3/4" Pipe Taps 1/2" Drill for sizes 4" and over 3/8" Drill for size 3" 1/4" Drill for sizes 2 1/2" and under. ± Available in any required larger size

7 Orifice s Slip-On, & Class 900 ASME B16.36 COMMON DIMENSIONS O.D at Base Minimum C Bore Slip- On LENGTH THRU HUB Y Diam. at Bevel to Counterbore O R X RF RTJ B2 RF RTJ RF RTJ A F ¼ ½ ½ APPROXIMATE WEIGHT PER UNION (Pounds) Bolt Circle DRILLING Number Bolts BOLTING Stud bolt Length RF RTJ RF RTJ RF RTJ ¼ ½ ½ All Dimensions are in inches. B1 Weld Neck bore to be specified by purchaser. Lengths include thickness two nuts but not height crown. 3/4" Pipe Taps 1/2" Drill for sizes 4" and over 3/8" Drill for size 3" 1/4" Drill for sizes 2 1/2" and under. ± Available in any required larger size

8 Orifice s Slip-On, & Class 1500 ASME B16.36 COMMON DIMENSIONS O.D at Base Minimum C Bore Slip- On LENGTH THRU HUB Y Diam. at Bevel to Counterbore O R X RF RTJ B2 RF RTJ RF RTJ A F ¼ ½ ½ APPROXIMATE WEIGHT PER UNION (Pounds) Bolt Circle DRILLING Number Bolts BOLTING Stud bolt Length RF RTJ RF RTJ RF RTJ ¼ ½ ½ All Dimensions are in inches. B1 Weld Neck bore to be specified by purchaser. Lengths include thickness two nuts but not height crown. 3/4" Pipe Taps 1/2" Drill for sizes 4" and over 3/8" Drill for size 3" 1/4" Drill for sizes 2 1/2" and under. ± Available in any required larger size

9 Orifice s Class 2500 ASME B16.36 Pitch P Ring Type Joint Groove Depth Groove Width E F Radius at Bottom r max Spec. Oval R.H. W Groove # R18 R23 R26 R28 R32 R38 R47 R51 R55 R60 Dia. Of Bolt Bolt Dia. Bolt Circle Dia # Bolt O. D. O Thkns C Dia. R Dia. at Base X Dia. at Point Welding A Length thru Y Dia. Of Pressure Connection TT in. 1 ½ in. 2 in. 2 ½ in. 3 in. 4 in. 6 in. 8 in. 10 in. 12 (1) Bore to be specified by purchaser. (2) Other NPT sizes may be furnished if requested

10 Orifice s Class 300 ASME B16.36 Size at Base Length thru Counterbore Counterbore Depth (From ) Pressure Connection O C R X Y Qb (2) Qf (3) F G TT 1 in ¼ ⅝ ½ in ¼ ¾ in ¼ ⅝ ½ in ¼ ¾ in ⅜ ¾ in ½ ¾ in ½ ¾ in ½ ⅞ Number Bolt Dia. Bolt holes Dia. Bolts Dia. Bolt Circle (1) Other NPT sizes may be furnished if required. (2) Qb = Counter Bore Back (3) Qf = Counter Bore

11 Slip-On Orifice s Class 300 ASME B16.36 Size at Base Length thru Bore Pressure Connection O C R X Y B TT Number Bolt Bolt Bolts Bolt Circle 1 in ¼ ⅝ ½ in ¼ ¾ in ¼ ⅝ ½ in ¼ ¾ in ⅜ ¾ in ½ ¾ in ½ ¾ in ½ 12 1 ⅞ in ½ in ½ ⅛ in ½ ⅛ in ½ ¼ in ½ ¼ in ½ ¼ in ½ ½ (1) Other NPT sizes may be furnished if required

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